Sorry about the gender mix up. No intent behind it. If someone accidently thought me a girl I guess I would also react. Yes I have had my rabies shots.
We both have to mark our respective territiories it seems. I have four daughters that try to keep me in line. Probably with questionable results. The wife even beats up on my head periodically. . I deserve it I imagine. Yet in my shell shocked condition it is hard to evaluate it. Five against one is only fair in their world.
Label your injectors 1-5 when you pull them to sub with the loaners. The condition of the injector nose might indicate the cylinder with a problem.
Thats if there is one. Same as is done with spark plugs. Hope it is just an injector problem.
The nailing symptom seems to point in that direction in my opinion. You may find that us guys are not always right as well though. Hard to believe this at first mention I fully realise.